One round after the trigger door is opened, the trap is sprung and the pillar begins to rotate, firing blunt arrows at every character in the room. The trap runs for 10 full rounds, after which it is exhausted and must be manually reloaded. Each round, the pillar fires 1d4 blunt arrows at each character in the chamber. Characters holding a tower shield can gain total cover as a standard action, avoiding all of these attacks. A character standing behind the character holding the tower shield gains a +4 cover bonus; any other characters lined up in this fashion only gain a +2 cover bonus to AC.